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The transition from a TEM-like mode to a plasmonic mode in parallel-plate waveguides
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View: Figures


Image of FIG. 1.
FIG. 1.

Signals measured inside (blue), at the edge (red), and outside (black) of the waveguide. These locations are illustrated by the cross-sectional view in the upper-right inset. The lower-right inset shows the corresponding spectra, which all have spectral bandwidths similar to that of the input THz pulse. These indicate that the scattering probe technique does not introduce any significant spectral distortion or bandwidth limitation on the measured signals. The left inset shows a photograph of the PPWG with the scattering probe inserted between the plates. The plate-width along the direction is 10 mm.

Image of FIG. 2.
FIG. 2.

Contour plots of the normalized cross-sectional electric field distribution based on (a) experimental data and (b) numerical simulations using the finite element method. The horizontal axis gives the location of the measurement and the vertical axis gives the frequency. The waveguide extends from to 5 mm. Each row of these figures has been normalized to unity, in order to remove the spectral dependence of the input pulse and emphasize the frequency-dependent mode transition. Results for three different values of the plate separation are shown.

Image of FIG. 3.
FIG. 3.

The transition frequency as a function of the plate separation . The black circles are the experimental results and the solid line is the calculated curve from the theoretical model described in the text. The inset shows two vertical cuts extracted from the data of Fig. 2(a), for . The cross-over point of these two curves defines the transition frequency.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The transition from a TEM-like mode to a plasmonic mode in parallel-plate waveguides